I had executed tcode *stad* and gave list of transaction codes exeucted from last 24 hours. Still they are unable to find who has deleted the data. No entry in system log is available.
Anyone, who's able to write ABAP programs, has full access to the database and thus can delete all the data.
Additionally users with permission can use SE14 to delete table contents completely.
It's hard to find out what happened, if not impossible :(






